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Totem pole pfc circuit, pulse width control method, air conditioner and storage medium

A technology of pulse width control and totem pole, applied in the field of totem pole PFC circuit, air conditioner and storage medium, and pulse width control method, can solve the problems of low efficiency of totem pole PFC circuit, etc., and reduce the number of short-circuit currents flowing, Effect of improving power factor and reducing reactive power

Active Publication Date: 2020-04-21
GD MIDEA AIR CONDITIONING EQUIP CO LTD +1
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  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a totem pole PFC circuit, a pulse width control method, an air conditioner and a storage medium, aiming at solving the technical problem that the efficiency of the existing totem pole PFC circuit is low

Method used

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  • Totem pole pfc circuit, pulse width control method, air conditioner and storage medium
  • Totem pole pfc circuit, pulse width control method, air conditioner and storage medium
  • Totem pole pfc circuit, pulse width control method, air conditioner and storage medium

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[0117] Based on the first embodiment, the second embodiment of the pulse width control method of the present invention is proposed, referring to Figure 4 , in this embodiment, the number of pulse changes is 3 times, and the pulse time interval includes a first preset duration, a second preset duration and a third preset duration. Wherein, the first preset duration, the second preset duration and the third preset duration can be reasonably set according to the requirements of the totem pole PFC circuit.

[0118] Step S300 includes;

[0119] Step S310, when the conduction duration of the fourth switch unit reaches the first preset duration, control the conduction of the second switch unit, and calculate a first pulse width based on the first bus voltage of the load;

[0120] In this embodiment, when the first switch unit Q1, the second switch unit Q2 and the third switch unit Q3 are controlled to be turned off, and the fourth switch unit Q4 is controlled to be turned on, if th...

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Abstract

The invention discloses a totem-pole PFC circuit. The totem-pole PFC circuit comprises a bridge circuit, an electric reactor, a bus bar capacitor, a sampling resistor and a control module, wherein thecontrol module is used for controlling the switching state of each switch unit and the pulse width when each switch unit is switched on according to the input voltage of the input end of the bridge circuit and the bus bar voltage of a load when the current of the sampling resistor is smaller than or equal to a preset current threshold value. The invention also discloses a pulse width control method, an air conditioner and a storage medium. Appropriate pulse switch is selected for each switch unit according to the input voltage and the bus bar voltage while the switching times of each switch unit are reduced, the switching times can be reduced under the premise of meeting the current harmonic requirement of the totem-pole PFC circuit and improving the power factor of the totem-pole PFC circuit, and then the switching loss is reduced while the reactive power in the circuit is reduced, and the efficiency of the totem-pole PFC circuit is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioners, in particular to a totem pole PFC circuit, a pulse width control method, an air conditioner and a storage medium. Background technique [0002] With the development of power electronics technology, active PFC (Power Factor Correction, power factor correction) technology has been widely used due to its advantages of high power factor, small harmonic current, and stable output voltage. [0003] At present, the BOOST type PFC is generally used. This kind of PFC has a simple structure and convenient control, but its efficiency is relatively low. Therefore, in some occasions that require high efficiency, a bridgeless totem pole PFC circuit is used, which reduces the number of devices on the loop and improves efficiency. [0004] In the existing totem-pole PFC circuit, the times of switching on / off predetermined switching units in each half cycle are controlled by the power supply voltage, an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/42
CPCH02M1/4233Y02B70/10
Inventor 曾贤杰
Owner GD MIDEA AIR CONDITIONING EQUIP CO LTD
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